Also, well, I mean... If there's all that time/effort involved... Just get yourself some tea, coffee, doodle on some piece of paper, do some push-ups, some yoga, prey, meditate, breathe and then... Code, lol!
So, actually, on the museum's ticketing site they say that the internet tickets are sold out, but if you actually get there, there's a limited amount of tickets that are sold each day (because not everyone uses the internet) : "Merci de noter que des places pour la visite le jour même sont en vente chaque jour directement à l'accueil de l'exposition, dans la limite des places disponibles.".